button{
    padding: 3px;
    margin-top: 20px;
    margin-left: 50px;
    background-color: darkcyan;
    color: yellow;
    width: auto;
    height: 50px;
    font-size: 20px;
    font-style: normal;
    font-family: 微软雅黑 sans-serif;
    align-content: center;
}